86 lines
2.0 KiB
PHP
86 lines
2.0 KiB
PHP
<?php
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/*
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* This file is part of the overtrue/wechat.
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*
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* (c) overtrue <i@overtrue.me>
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*
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* This source file is subject to the MIT license that is bundled
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* with this source code in the file LICENSE.
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*/
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namespace EasyWeChat\Kernel\Support;
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/**
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* Class AES.
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*
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* @author overtrue <i@overtrue.me>
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*/
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class AES
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{
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/**
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* @param string $text
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* @param string $key
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* @param string $iv
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* @param int $option
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*
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* @return string
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*/
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public static function encrypt(string $text, string $key, string $iv, int $option = OPENSSL_RAW_DATA): string
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{
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self::validateKey($key);
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self::validateIv($iv);
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return openssl_encrypt($text, self::getMode($key), $key, $option, $iv);
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}
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/**
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* @param string $cipherText
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* @param string $key
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* @param string $iv
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* @param int $option
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* @param string|null $method
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*
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* @return string
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*/
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public static function decrypt(string $cipherText, string $key, string $iv, int $option = OPENSSL_RAW_DATA, $method = null): string
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{
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self::validateKey($key);
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self::validateIv($iv);
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return openssl_decrypt($cipherText, $method ?: self::getMode($key), $key, $option, $iv);
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}
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/**
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* @param string $key
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*
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* @return string
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*/
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public static function getMode($key)
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{
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return 'aes-'.(8 * strlen($key)).'-cbc';
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}
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/**
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* @param string $key
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*/
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public static function validateKey(string $key)
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{
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if (!in_array(strlen($key), [16, 24, 32], true)) {
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throw new \InvalidArgumentException(sprintf('Key length must be 16, 24, or 32 bytes; got key len (%s).', strlen($key)));
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}
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}
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/**
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* @param string $iv
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*
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* @throws \InvalidArgumentException
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*/
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public static function validateIv(string $iv)
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{
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if (!empty($iv) && 16 !== strlen($iv)) {
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throw new \InvalidArgumentException('IV length must be 16 bytes.');
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}
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}
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}
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